Python - Gain of Pyramidal Horn Antenna

# Formula to calculate Gain of pyramidal horn antenna
# Gain = ((4 * Pi * Area of Aperature)/(Wavelength**2)) * Aperture Efficiency
# Aperature Efficiency is between 0 and 1
# Use functions for top number, bottom number and final calculation


import math

print ("Formula to compute Gain of pyramidal horn antenna")
print ("The formula for watts is: Gain = ((4 * Pi * Area of Aperature)/(Wavelength**2)) * Aperture Efficiency")

# Define functions that will calculate the formula

# Calculate the top of the formula
def topofformula():
    EnteredAreaOfAperature = input ("Enter the area of aperature in square meters: ")
    # Convert to integer
    AreaOfAperature = int(EnteredAreaOfAperature)
    TopOfFormula = (4* math.pi * AreaOfAperature )
    print("Top of formula is: ", TopOfFormula)
    return TopOfFormula

# Calculate the bottom of the formula
def bottomofformula():
    EnteredWavelength = input ("Enter the wavelength in meters: ")
    # Convert to integer
    Wavelength = float(EnteredWavelength)
    BottomOfFormula = (Wavelength**2)
    print("The bottom of formula is: ", BottomOfFormula)
    return BottomOfFormula

# Use the top and bottom numbers to make final gain calculation
def calculatefinalformula(AperatureEfficiency):
    TopNumber = topofformula()
    BottomNumber = bottomofformula()
    Gain = ((TopNumber/BottomNumber) * AperatureEfficiency)
    return Gain

# Input the Aperture Efficiency
# Use while loop to make sure that the Aperture Efficiency is between 0 and 1
AperatureEfficiency = -1

while (AperatureEfficiency<0 or AperatureEfficiency>1):
    EnteredAperatureEfficiency = input ("Enter the Aperature Efficiency (number between 0 and 1): ")
    # Convert to float
    AperatureEfficiency = float(EnteredAperatureEfficiency)
    # Test to see if the number is between 0 and 1
    if AperatureEfficiency<0:
       print ("Your number is less than zero.  Please enter a number between 0 and 1.")
    elif AperatureEfficiency>1:
       print ("Your number is greater than one.  Please enter a number between 0 and 1..")
    else:
        print ("You entered: ", AperatureEfficiency)
        
# Place result from function into variable to print
GainToPrint = calculatefinalformula(AperatureEfficiency)
print ("The Gain in dB is: ", GainToPrint)